r - 複数のファイルに strsplit 関数を適用する

Question

コードのステップ 4 で間違っていることを誰かが見つけてくれませんか (strsplit)。

ディレクトリに「101_E45_N66.csv」、「102_E46_N76.csv」、「103_E47_N86.csv」という名前の 3 つのファイルがあります。

リストでそれらを読み込んで、名前を分割して、各ファイルに 3 つの新しい列を追加しようとしています。

次のように、個々のファイルに対してどのように実行できるかについての以前の質問から知っています。

filename <- '101_E45_N66.csv'
    ## spliting name "101_E45_N66.csv" to create 3 new coloumn within dataframe
            s = strsplit(filename,"_",,fixed=TRUE)[[1]] 
    df1= cbind(df[,c("type","date")],ID=s[1],name1=s[2],name2=s[3],df[,3:ncol(df)])

しかし、リストに適用するlapply関数を作成しようとしているとき、ファイル名の1つだけを使用し、3つのファイルすべてに同じ名前の列を追加するように見えるため、何が間違っているのかわかりません.ファイルをディレクトリに戻します (コードのステップ 4 を参照してください)。使用しているコードは次のとおりです。

 mycsv = dir(pattern=".csv")

n <- length(mycsv) 

## step 1 - read file 
mylist <- vector("list", n) 

for(i in 1:n) mylist[[i]] <- read.csv(mycsv[i],header = TRUE,skip =5, nrow = length(count.fields(mycsv[i])) - 12) 

## step 2 - Change coloumn name
mylist <- lapply(mylist, function(x) {names(x) <- c("type","date","v1","v2","v3","v4","v5","v6","v7") ; return(x)}) 

## step 3 - changing type coloumn for weekday/weekend

mylist <- lapply(mylist, function(x) {
    f = c("wd", "we", "we", "wd", "wd", "wd", "wd")
    x$type = rep(f,52, length.out = 30)
    return(x)
}) 

## Step 4 - spliting filename to create 3 new coloumn within dataframe

    mylist <- lapply(mylist, function(x) {
            s = strsplit(mycsv[i],"_",,fixed=TRUE)[[1]]
    d = cbind(x[,c("type","date")],ID=s[1],Easting=s[2],Northing=s[3],x[,3:ncol(x)])
    return(d)
})  
    ## Step 5- writre the data back in the directory
      for(i in 1:n)    
        write.csv(file = paste("file", i, ".csv", sep = ""),    mylist[i], row.names = F)

ステップ4で私が間違っていることを教えてください。

どうもありがとう、
アヤン

私のサンプルデータ:

> dput (mylist)
list(structure(list(type = c("wd", "we", "we", "wd", "wd", "wd", 
"wd", "wd", "we", "we", "wd", "wd", "wd", "wd", "wd", "we", "we", 
"wd", "wd", "wd", "wd", "wd", "we", "we", "wd", "wd", "wd", "wd", 
"wd", "we"), date = structure(c(1L, 11L, 18L, 9L, 26L, 30L, 22L, 
5L, 14L, 15L, 6L, 23L, 27L, 19L, 2L, 10L, 16L, 7L, 24L, 28L, 
20L, 3L, 12L, 17L, 8L, 25L, 29L, 21L, 4L, 13L), .Label = c("Fri 1 Jan", 
"Fri 15 Jan", "Fri 22 Jan", "Fri 29 Jan", "Fri 8 Jan", "Mon 11 Jan", 
"Mon 18 Jan", "Mon 25 Jan", "Mon 4 Jan", "Sat 16 Jan", "Sat 2 Jan", 
"Sat 23 Jan", "Sat 30 Jan", "Sat 9 Jan", "Sun 10 Jan", "Sun 17 Jan", 
"Sun 24 Jan", "Sun 3 Jan", "Thu 14 Jan", "Thu 21 Jan", "Thu 28 Jan", 
"Thu 7 Jan", "Tue 12 Jan", "Tue 19 Jan", "Tue 26 Jan", "Tue 5 Jan", 
"Wed 13 Jan", "Wed 20 Jan", "Wed 27 Jan", "Wed 6 Jan"), class = "factor"), 
    v1 = c(322L, 89L, 242L, NA, 136L, 113L, 70L, 134L, 232L, 
    NA, 127L, 124L, 120L, 162L, 179L, 374L, 477L, NA, 147L, 136L, 
    152L, 196L, 384L, 491L, 136L, NA, 143L, 172L, 226L, 509L), 
    v2 = c(409L, 71L, 206L, NA, 104L, 57L, NA, 98L, 201L, NA, 
    74L, 94L, 69L, 98L, 117L, 277L, 445L, NA, 131L, 90L, 83L, 
    NA, 329L, 473L, 73L, NA, 104L, 113L, 136L, 427L), v3 = c(367L, 
    54L, 211L, NA, 107L, 69L, 51L, 63L, 157L, NA, 56L, 115L, 
    96L, 100L, 118L, 250L, 388L, NA, 124L, 85L, 96L, 118L, 313L, 
    431L, 79L, NA, 93L, 135L, 134L, 290L), v4 = c(343L, 60L, 
    183L, NA, 110L, 53L, 32L, 77L, 123L, NA, 37L, 100L, 64L, 
    68L, 99L, 199L, 333L, NA, 107L, 71L, 81L, 89L, 219L, 393L, 
    43L, NA, 72L, 96L, 127L, NA), v5 = c(231L, 42L, 79L, NA, 
    74L, 58L, 48L, 59L, 78L, NA, 62L, 74L, 63L, 59L, 74L, 110L, 
    134L, NA, 74L, 82L, 59L, 73L, 135L, 170L, 53L, NA, 61L, 72L, 
    67L, 186L), v6 = c(140L, 41L, 57L, NA, 104L, 92L, 89L, 94L, 
    68L, NA, 116L, 131L, NA, 110L, 125L, 89L, 89L, NA, 113L, 
    124L, 115L, 116L, 95L, 77L, 126L, NA, 110L, 122L, 119L, 122L
    ), v7 = c(90L, 104L, 82L, NA, 368L, 258L, NA, 289L, 117L, 
    NA, 395L, 416L, 397L, 391L, 400L, 132L, 101L, NA, 397L, 426L, 
    418L, 411L, 151L, 66L, 396L, NA, 457L, 437L, 428L, 128L)), .Names = c("type", 
"date", "v1", "v2", "v3", "v4", "v5", "v6", "v7"), row.names = c(NA, 
-30L), class = "data.frame"), structure(list(type = c("wd", "we", 
"we", "wd", "wd", "wd", "wd", "wd", "we", "we", "wd", "wd", "wd", 
"wd", "wd", "we", "we", "wd", "wd", "wd", "wd", "wd", "we", "we", 
"wd", "wd", "wd", "wd", "wd", "we"), date = structure(c(1L, 11L, 
18L, 9L, 26L, 30L, 22L, 5L, 14L, 15L, 6L, 23L, 27L, 19L, 2L, 
10L, 16L, 7L, 24L, 28L, 20L, 3L, 12L, 17L, 8L, 25L, 29L, 21L, 
4L, 13L), .Label = c("Fri 1 Jan", "Fri 15 Jan", "Fri 22 Jan", 
"Fri 29 Jan", "Fri 8 Jan", "Mon 11 Jan", "Mon 18 Jan", "Mon 25 Jan", 
"Mon 4 Jan", "Sat 16 Jan", "Sat 2 Jan", "Sat 23 Jan", "Sat 30 Jan", 
"Sat 9 Jan", "Sun 10 Jan", "Sun 17 Jan", "Sun 24 Jan", "Sun 3 Jan", 
"Thu 14 Jan", "Thu 21 Jan", "Thu 28 Jan", "Thu 7 Jan", "Tue 12 Jan", 
"Tue 19 Jan", "Tue 26 Jan", "Tue 5 Jan", "Wed 13 Jan", "Wed 20 Jan", 
"Wed 27 Jan", "Wed 6 Jan"), class = "factor"), v1 = c(322L, 89L, 
242L, NA, 136L, 113L, 70L, 134L, 232L, NA, 127L, 124L, 120L, 
162L, 179L, 374L, 477L, NA, 147L, 136L, 152L, 196L, 384L, 491L, 
136L, NA, 143L, 172L, 226L, 509L), v2 = c(409L, 71L, 206L, NA, 
104L, 57L, NA, 98L, 201L, NA, 74L, 94L, 69L, 98L, 117L, 277L, 
445L, NA, 131L, 90L, 83L, NA, 329L, 473L, 73L, NA, 104L, 113L, 
136L, 427L), v3 = c(367L, 54L, 211L, NA, 107L, 69L, 51L, 63L, 
157L, NA, 56L, 115L, 96L, 100L, 118L, 250L, 388L, NA, 124L, 85L, 
96L, 118L, 313L, 431L, 79L, NA, 93L, 135L, 134L, 290L), v4 = c(343L, 
60L, 183L, NA, 110L, 53L, 32L, 77L, 123L, NA, 37L, 100L, 64L, 
68L, 99L, 199L, 333L, NA, 107L, 71L, 81L, 89L, 219L, 393L, 43L, 
NA, 72L, 96L, 127L, NA), v5 = c(231L, 42L, 79L, NA, 74L, 58L, 
48L, 59L, 78L, NA, 62L, 74L, 63L, 59L, 74L, 110L, 134L, NA, 74L, 
82L, 59L, 73L, 135L, 170L, 53L, NA, 61L, 72L, 67L, 186L), v6 = c(140L, 
41L, 57L, NA, 104L, 92L, 89L, 94L, 68L, NA, 116L, 131L, NA, 110L, 
125L, 89L, 89L, NA, 113L, 124L, 115L, 116L, 95L, 77L, 126L, NA, 
110L, 122L, 119L, 122L), v7 = c(90L, 104L, 82L, NA, 368L, 258L, 
NA, 289L, 117L, NA, 395L, 416L, 397L, 391L, 400L, 132L, 101L, 
NA, 397L, 426L, 418L, 411L, 151L, 66L, 396L, NA, 457L, 437L, 
428L, 128L)), .Names = c("type", "date", "v1", "v2", "v3", "v4", 
"v5", "v6", "v7"), row.names = c(NA, -30L), class = "data.frame"), 
    structure(list(type = c("wd", "we", "we", "wd", "wd", "wd", 
    "wd", "wd", "we", "we", "wd", "wd", "wd", "wd", "wd", "we", 
    "we", "wd", "wd", "wd", "wd", "wd", "we", "we", "wd", "wd", 
    "wd", "wd", "wd", "we"), date = structure(c(1L, 11L, 18L, 
    9L, 26L, 30L, 22L, 5L, 14L, 15L, 6L, 23L, 27L, 19L, 2L, 10L, 
    16L, 7L, 24L, 28L, 20L, 3L, 12L, 17L, 8L, 25L, 29L, 21L, 
    4L, 13L), .Label = c("Fri 1 Jan", "Fri 15 Jan", "Fri 22 Jan", 
    "Fri 29 Jan", "Fri 8 Jan", "Mon 11 Jan", "Mon 18 Jan", "Mon 25 Jan", 
    "Mon 4 Jan", "Sat 16 Jan", "Sat 2 Jan", "Sat 23 Jan", "Sat 30 Jan", 
    "Sat 9 Jan", "Sun 10 Jan", "Sun 17 Jan", "Sun 24 Jan", "Sun 3 Jan", 
    "Thu 14 Jan", "Thu 21 Jan", "Thu 28 Jan", "Thu 7 Jan", "Tue 12 Jan", 
    "Tue 19 Jan", "Tue 26 Jan", "Tue 5 Jan", "Wed 13 Jan", "Wed 20 Jan", 
    "Wed 27 Jan", "Wed 6 Jan"), class = "factor"), v1 = c(322L, 
    89L, 242L, NA, 136L, 113L, 70L, 134L, 232L, NA, 127L, 124L, 
    120L, 162L, 179L, 374L, 477L, NA, 147L, 136L, 152L, 196L, 
    384L, 491L, 136L, NA, 143L, 172L, 226L, 509L), v2 = c(409L, 
    71L, 206L, NA, 104L, 57L, NA, 98L, 201L, NA, 74L, 94L, 69L, 
    98L, 117L, 277L, 445L, NA, 131L, 90L, 83L, NA, 329L, 473L, 
    73L, NA, 104L, 113L, 136L, 427L), v3 = c(367L, 54L, 211L, 
    NA, 107L, 69L, 51L, 63L, 157L, NA, 56L, 115L, 96L, 100L, 
    118L, 250L, 388L, NA, 124L, 85L, 96L, 118L, 313L, 431L, 79L, 
    NA, 93L, 135L, 134L, 290L), v4 = c(343L, 60L, 183L, NA, 110L, 
    53L, 32L, 77L, 123L, NA, 37L, 100L, 64L, 68L, 99L, 199L, 
    333L, NA, 107L, 71L, 81L, 89L, 219L, 393L, 43L, NA, 72L, 
    96L, 127L, NA), v5 = c(231L, 42L, 79L, NA, 74L, 58L, 48L, 
    59L, 78L, NA, 62L, 74L, 63L, 59L, 74L, 110L, 134L, NA, 74L, 
    82L, 59L, 73L, 135L, 170L, 53L, NA, 61L, 72L, 67L, 186L), 
        v6 = c(140L, 41L, 57L, NA, 104L, 92L, 89L, 94L, 68L, 
        NA, 116L, 131L, NA, 110L, 125L, 89L, 89L, NA, 113L, 124L, 
        115L, 116L, 95L, 77L, 126L, NA, 110L, 122L, 119L, 122L
        ), v7 = c(90L, 104L, 82L, NA, 368L, 258L, NA, 289L, 117L, 
        NA, 395L, 416L, 397L, 391L, 400L, 132L, 101L, NA, 397L, 
        426L, 418L, 411L, 151L, 66L, 396L, NA, 457L, 437L, 428L, 
        128L)), .Names = c("type", "date", "v1", "v2", "v3", 
    "v4", "v5", "v6", "v7"), row.names = c(NA, -30L), class = "data.frame"))

score 1 · Accepted Answer

問題は、呼び出しiに存在しないファイル名にインデックスを付けようとすることです。lapply

mylistとに共通のインデックスが必要なmycsvため、単純なループを使用するか、ここで呼び出すことを主張する場合は、lapply次のようなものを試してください。

lapply(1:length(mylist), function(i) {
    mylist.i <- mylist[[i]]
    s = strsplit(mycsv[i], "_" , fixed = TRUE)[[1]]
    d = cbind(mylist.i[, c("type", "date")], ID = s[1], Easting = s[2], Northing = s[3], mylist.i[, 3:ncol(mylist.i)])
    return(d)
})

mycsvこれがなければ、これをテストできず、コードの他の部分をチェックしようとしなかったことに注意してください。

r - 複数のファイルに strsplit 関数を適用する

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